1 files changed, 32 insertions, 0 deletions

diff --git a/tests/vm/mmap-read.c b/tests/vm/mmap-read.c
new file mode 100644
index 0000000..c0f23a1
--- /dev/null
+++ b/tests/vm/mmap-read.c
@@ -0,0 +1,32 @@
+/* Uses a memory mapping to read a file. */
+
+#include <string.h>
+#include <syscall.h>
+#include "tests/vm/sample.inc"
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void)
+{
+  char *actual = (char *) 0x10000000;
+  int handle;
+  mapid_t map;
+  size_t i;
+
+  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
+  CHECK ((map = mmap (handle, actual)) != MAP_FAILED, "mmap \"sample.txt\"");
+
+  /* Check that data is correct. */
+  if (memcmp (actual, sample, strlen (sample)))
+    fail ("read of mmap'd file reported bad data");
+
+  /* Verify that data is followed by zeros. */
+  for (i = strlen (sample); i < 4096; i++)
+    if (actual[i] != 0)
+      fail ("byte %zu of mmap'd region has value %02hhx (should be 0)",
+            i, actual[i]);
+
+  munmap (map);
+  close (handle);
+}